Split the entire pipeline
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Select Tools > Automatic Straight Split Command
to display the Selection ribbon. You can also select Auto Straight Split on the Tools toolbar.
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Select Whole Pipeline in the Split list.
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Type the length value in the Length box.
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In the Using list, specify whether to use a Weld or a Coupling to break the pipeline, and then click
to display the Select New Material dialog.
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Select the item code to use, and then click OK.
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Click OK
on the Selection ribbon to apply the splitting process.
Split a section of the pipeline
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Select Tools > Automatic Straight Split Command
to display the Selection ribbon. You can also select Auto Straight Split on the Tools toolbar.
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Select Selection in the Split list.
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In the Graphics window, select the pipe leg to split.
The software displays a flag to identify the start point of the split.
To move the split start point to the other end of the pipe leg, select Toggle flag 
on the Selection ribbon.
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Type the length value in the Length box.
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In the Using list, specify whether to use a Weld or a Coupling to break the pipeline, and then select
to display the Select New Material dialog.
-
Select the item code to use, and then click OK.
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Select OK
on the Selection ribbon to apply the splitting process.